Objective: In this study, the reliability, validity and factorial analysis of the Turkish version of the Scale for the Assessment of Illness Behaviour (SAIB) which was developed by Rief et al., were evaluated. In contrast to other similar scales, SAIB focuses on genuine behavioral aspects and it reflects the multidimensional structure of illness behaviour.
Method: The study was carried out with 200 patients in Erenköy Training and Research Hospital for Psychiatric and Neurological Diseases, Erenköy Physical Therapy and Rehabilitation Hospital, and Kartal Research and Training Hospital, and 240 healthy students in Karadeniz Technical University as the control group. Participants were investigated with the SAIB, the Beck Depression Inventory (BDI) and the Symptom Check List-revised form (SCL-90R). SAIB were given to sixty of the student group a month later. Factor analysis for the SAIB items was performed. Internal consistency was examined through Cronbach’s alpha test evaluation. Besides this, test-retest reliability was viewed and the interrelationships with other measures (BDI and SCL-90R) were examined.
Results: A modest correlation level was obtained for the scale total (r: 0.68) score. The scale also showed acceptable internal consistency (Cronbach alpha: 0.81). Whereas 5 item (item#6, 11, 18, 19, 20) in the control group had low item-total score correlation. The Turkish version of SAIB showed a four factor model and explained 44.7% of the total variance. The validity analysis of the scale resulted in a significant difference between total scores of the control and patient’s group. Criterion related validity of the SAIB was shown to have medium-low associations with some aspect of the SCL-90R, BDI and the number of the SCL-90R somatization subscale.
Conclusion: The findings of the preliminary study of the internal reliability, test-retest and item-total score correlation, factorial construct, discriminating power for specific groups and criterion related validity of the SAIB indicated that the scale could be used in Turkish population, keeping in mind its limitations.
Key words: Scale for the assessment of illness behaviour-SAIB, factor analysis, reliability, validity
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